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From: Adrian Chadd <adrian@freebsd.org>
To: Ian Lepore <freebsd@damnhippie.dyndns.org>
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Cc: lev@freebsd.org, freebsd-current@freebsd.org
Subject: Re: Latest -CURRENT/i386 could not start under VirutalBox 4.1.18 and
 4.2 (Windows host): hangs up after atrtc0 detection
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On 19 September 2012 14:05, Ian Lepore <freebsd@damnhippie.dyndns.org> wrote:

>> Add something to atrtc_start() to only loop over that loop say, 64k
>> times before dropping out; and print an error if it hits that
>> condition.
>>
>> Also, what's that RTCSA_8192 bit do?
>
> That should set the interrupt rate really high, to minimize the time
> wasted waiting for the status bit to change in the register.  Maybe
> that's the part that vbox isn't emulating well and so it never simulates
> an interrupt and leaves that loop.  Or maybe because the loop is a tight
> busy-wait the emulator never gets control to simulate the occurance of
> the interrupt.

Right. Being totally clueless, is atrc_start() called just at
probe/attach, or during normal operation?


adrian